OBJWUN

OBJWUN - Isomorphic ES3 tool

Utility functions:

assign ~ clone ~ debounce ~ every ~ filter ~ find ~ findIndex ~ forEach ~ fromEntries ~ get ~ id ~ includes ~ intersection ~ isEmpty ~ keyBy ~ map ~ memoize ~ merge ~ omit ~ pick ~ reduce ~ remove ~ set ~ some ~ sortBy ~ times ~ uniq ~ uniqBy

and

isArray ~ isBigint ~ isBoolean ~ isDefined ~ isFunction ~ isNumber ~ isObject ~ isPrimitive ~ isString ~ isSymbol ~ isUndefined

additional utilities

constrain ~ getMapper

API

assign(literalObject, ...)

• parameters: zero or more object literals
• output: one object literal without references to arguments
• throws: whenever one argument passed is not an object literal

example

const ow = require("objwun");

const o1 = {a: 1, b: 2},
    o2 = {b: 3, c: 4},
    r = ow.assign(o1, o2); // {a:1, b:3, c: 4}

o2.c = 44;
console.log(r.c); // 4, not 44
console.log(o2.c); // 44

clone(literalObject)

• parameters: one object literal or array
• output: a cloned deep copy
• throws: if receives something that is not an object literal or an array

example

const ow = require("objwun");

const o1 = {a: 1, b: 2, c: {b: 3, c: 4}},
    o2 = ow.clone(o1);

o1.c = 44;
console.log(o2.c.c); // 4
console.log(o1.c); // 44

constrain(x Number, a Number, bNumber)

• parameters:

  • x: the number to constrain
  • a: bottom constrain
  • b: top constrain

• throws: if one of the parameter is not a number

example

const ow = require("objwun");

const c1 = ow.constrain(0, 1, 2}, // 1
    c2 = ow.constrain(3.3, 1, 2}, // 2
    c3 = ow.constrain(1.3, 1, 2}; // 1.3

debounce(functionToBeDebounced, delayMilliseconds)

• parameters:
  • a function to be debounced
  • number of waiting millisecond
• output: the debounced function
• throws: if receives something that is not an function as first parameter, or a number as second one

example

const ow = require("objwun");

const debounced = ow.debounce(function (a,b,c) {
    console.log(a,b,c)
}, 2e3);

debounced(1,2,3); // after 1 sec 1,2,3

every(array|literalObject, checking function )

• parameters:
  • the source array or literal object
  • a function to check a condition
• output: resulting boolean
• throws: if the first argument is not an array or a object literal; if the second argument is not a function

example

const ow = require("objwun");
const o = {
    a: 1, b: 2,
    c: 3, d: 4
},
a = [1, 2, 3, 4];

console.log(ow.every(o, (el, k) => round(el, 10) === el))
// true

console.log(ow.every(a, (el, k) => el < 3))
// false

filter(array|literalObject, filter Function)

• parameters:
  • an array or a object literal
  • the filter function
• output: the filtered array or object (with references)
• throws: if receives something that is not an array or object literal as first parameter, or is not a function as second one

example

const ow = require("objwun");

const o = {a: 1, b: 2, c: 3, d: 4, e: 5},
    a = [{a: 1}, {a: 2}, {a: 3}, {a: 4}, {a: 5}],

    f = (e, k, oa) => e % 2,

    o1 = ow.filter(o, f),
    a1 = ow.filter(a, f);

console.log(o1); // {a:1, c:3, e: 5}
console.log(a1); // [{a: 1}, {a: 3}, {a: 5}]

find(array|literalObject, matcher function)

• parameters:
  • an array or a object literal
  • the matcher function
• output: the first matching result
• throws: if receives something that is not an array or object literal as first parameter, or is not a function as second one

example

const ow = require("objwun");

const o = {ao: 1, bo: 2, co: 3, do: 4, eo: 5},
    a = [{a: 1}, {a: 2}, {a: 3}, {a: 4}, {a: 5}],

    f = (e, k, oa) => e.a >= 3 || `${k}`.match(/^b/),

    o1 = ow.find(o, f),
    a1 = ow.find(a, f);

console.log(o1); // 2
console.log(a1); // { a: 3 }

findIndex(array|literalObject, matcher function)

• parameters:
  • an array or a object literal
  • the matcher function
• output: the first matching result
• throws: if receives something that is not an array or object literal as first parameter, or is not a function as second one

example

const ow = require("objwun");

const o = {ao: 1, bo: 2, co: 3, do: 4, eo: 5},
    a = [{k: 1}, {k: 2}, {k: 3}, {k: 4}, {k: 5}],

    f = (e, key, oa) => e.k === 4 || e === 2,

    o1 = ow.findIndex(o, f),
    a1 = ow.findIndex(a, f);

console.log(o1); // bo
console.log(a1); // 3

forEach(array|literalObject, matcher function)

• parameters:
  • an array or a object literal
  • the iterator function
• output: depends on the iterator
• throws: if receives something that is not an array or object literal as first parameter, or is not a function as second one

example

const ow = require("objwun");

let ra = 0, ro = 0;
const o = {ao: 1, bo: 2, co: 3, do: 4, eo: 5, fo: 6},
    a = [{k: 1}, {k: 2}, {k: 3}, {k: 4}, {k: 5}],

    fo = (e, key, oa) => ro += e,
    fa = (e, key, oa) => ra += e.k;

ow.forEach(a, fa);
ow.forEach(o, fo);

console.log(ro); // 21
console.log(ra); // 15

fromEntries(array)

• parameters:
  • an array or pairs [key, value] to be used
• output: the resulting object using the key value found in the input array
• throws: if receives something that is not an array or any element in the array has size that is not 2

example

const ow = require("objwun");

const o = [
    ['just': 'a'],
    ['idiot': 'example']
]
const res = ow.fromEntries(o)
console.log(res); // {just: "an", idiot: "example"}

get(array|literalObject, pathString, defaultValue)

• parameters:
  • an array or a object literal
  • the path of the needed element
  • a default value in case the search goes wrong
• output: the found element o
• throws: if receives something that is not an array or object literal as first parameter, or is not a string the second one

example

const ow = require("objwun");

const o = {
    a: 1, b: 2, c: {
        a:11, b:22, c:33, d: {
            a:111,b:222
        }
    }},
    res1 = ow.get(o, 'c.d.a'),
    res2 = ow.get(o, 'c.d.a.z', 'nope');

console.log(res1) // 111
console.log(res2) // nope

getMapper(fromStart, fromEnd, toStart, toEnd)

• parameters:
  • domain start
  • domain end
  • codomain start
  • codomain end
• output: a mapping function that will accept one numeric value
• throws: if receives something that is not numeric or if fromEnd-fromStart is zero.

example

const ow = require("objwun");

const myMap = ow.getMapper(-10, 10, 50, 100);

console.log(myMap(0)) // 75
console.log(myMap(-20)) // 0

id

This is not a function but an object with a particular toString method associated, thus need to be casted to a string.

example

const ow = require("objwun");

console.log(ow.id + "") // id_1
console.log(ow.id + "") // id_2
console.log(ow.id + ow.id) // id_3id_4

includes(array|literalObject, any)

• parameters:
  • an array or a object literal
  • searched element
• output: a boolean
• throws: if receives something that is not an array or object literal as first parameter

example

const ow = require("objwun");

const o = {a: 1, b: 2, c: 'xxx'},
    a = [1, 2, 3, 'yyy'];

console.log(ow.includes(o, 'xxx')) // true
console.log(ow.includes(a, 2)) // true
console.log(ow.includes(a, 22)) // false

intersection(array, array, ...)

• parameters:
  • or or more arrays
• output: an array that contains the intersection (only including primitives)
• throws: if one of the parameters is not an array

example

const ow = require("objwun");

const a = [1, 2, 3, 'yyy', () => {}],
    b = [1, 'x', 3, 'yyy', () => {}];

console.log(ow.intersection(a, b)) /// [ 1, 3, 'yyy' ]

isEmpty(any)

• parameters:
  • anything
• output: a boolean
• throws: if undefined is passed

example

const ow = require("objwun");

console.log(ow.isEmpty(undefined)) // exception
console.log(ow.isEmpty(1)) // false
console.log(ow.isEmpty([])) // true
console.log(ow.isEmpty({})) // true
console.log(ow.isEmpty({a:1})) // false
console.log(ow.isEmpty('')) // true

keyBy(array, key string | key function)

• parameters:
  • an array
  • a string key, or a function returning it
• output: an object literal
• throws: if receives something that is not an array or object literal as first parameter, or not a string nor function as the second one

example

const ow = require("objwun");

const a = [{
    name: 'a',
    num: 10
},{
    name: 's',
    num: 4
}];

console.log(ow.keyBy(a, 'name'))
// { a: { name: 'a', num: 10 }, s: { name: 's', num: 4 } }

console.log(ow.keyBy(a, f => f.name+'_'))
// { a_: { name: 'a', num: 10 }, s_: { name: 's', num: 4 } }

map(array|literalObject, mappingFunction)

• parameters:
  • an array or a literal object
  • a mapping function
• output: an array or object literal depending on the input
• throws: if receives something that is not an array or object literal as first parameter, or not a string nor function as the second one

example

const ow = require("objwun");

const o = {name: 42, num: 10};
const a = [1, 2, 3, 4];

console.log(ow.map(o, e => e/2));
// { name: 21, num: 5 }

console.log(ow.map(a, e => e ** 2))
// [ 1, 4, 9, 16 ]

memoize(fn function)

• parameters:
  • the function that needs a to be memoized
• output: the memoized function (holds an extra reset attribute function to reset the memoized values)
• throws: if receives something that is not an a function

warning: for the moment this function works properly only when all parameters passed to the memoized function produce a unique value when given to toString. Thus [par1, par2, ...].toString() output should be uniquely obtainable passign exactly [par1, par2, ...].

example

const ow = require("objwun");
let calls = 0
const o = { num: 10 },
    fn = function(v) {
        calls++;
        return this.num * v;
    },
    mfn = ow.memoize(fn, o); // ctx is optional

console.log(mfn(3)); // 30
console.log(calls); // 1
console.log(mfn(3)); // 30
console.log(calls); // 1
mfn.reset()
console.log(mfn(3)); // 30
console.log(calls); // 2

merge(array|literalObject, ... )

• parameters:
  • one or more array or a literal object
• output: an object literal
• throws: if receives mixed array and object literal

example

const ow = require("objwun");

console.log(ow.merge({a: 1}, {b: 2}, {b: 3}));
// { a: 1, b: 3 }

console.log(ow.merge(["a", 1], ["b", 2], ["c", 3]));
// [ 'a', 1, 'b', 2, 'c', 3 ]

omit(literalObject, keyArray )

• parameters:
  • source literal object
  • array of keys
• output: resulting object
• throws: if receives mixed array and object literal

example

const ow = require("objwun");

console.log(ow.omit({a:1, b:2, c:3}, ['a', 'c']));
// { b: 2 }

console.log(ow.omit({a:1, b:2, c:3}, ['a']));
// { b: 2, c: 3 }

pick(literalObject, keyArray )

• parameters:
  • source literal object
  • array of keys
• output: resulting object
• throws: if receives mixed array and object literal

example

const ow = require("objwun");

console.log(ow.pick({a:1, b:2, c:3}, ['a', 'c']));
// { a: 1, c: 3 }

console.log(ow.pick({a:1, b:2, c:3}, ['a']));
// { a: 1 }

reduce(array|literalObject, reducer function, initial value, escapeFn )

this function is way faster than the native Array.reduce

• parameters:
  • the array or literal to reduce over
  • the reducing function
  • initial value, optional, default {} if objLiteral given , [] if array
  • escapeFn (optional): if passed will be called on each cycle receiving same args as the reducer function; breaks the execution when returning false and last acc value will be returned.
• output: resulting object
• throws: if the first argument is not an array or a object literal; if the second argument is not a function

example

const ow = require("objwun");
const o = {
        a: 1, b: 2,
        c: 3, d: 4
    },
    a = [1, 2, 3, 4];

console.log(ow.reduce(o,
    (acc, el, k) => {
        if (el % 2 === 0) acc[k] = el;
        return acc
    }
)); // { b: 2, d: 4 }

console.log(ow.reduce(a,
    (acc, el, k) => {
        if (el % 2 === 1) acc.push(el);
        return acc
    }
)); // [1, 3]

console.log(ow.reduce(a, (acc, el) =>{
    return acc * el
}, 1)); // 24

remove(array|literalObject, selecting function )

it mutates the first argument, this function is not pure

• parameters:
  • the array or literal to remove from
  • the function that selects the elements to be removed
• output: resulting object
• throws: if the first argument is not an array or a object literal; if the second argument is not a function

example

const ow = require("objwun");
const o = {
        a: 1, b: 2,
        c: 3, d: 4
    },
    a = [1, 2, 3, 4];

console.log(ow.remove(o, (el, k) => el % 2 === 0))
// { b: 2, d: 4 }
console.log(o)
// { a: 1, c: 3 }

console.log(ow.remove(a, (el, k) => el % 2 === 0))
// [ 2, 4 ]
console.log(a)
// [ 1, 3 ]

set(array|literalObject, string path, any value )

• parameters:
  • the source array or literal object
  • the target path to put the value
  • the element to be added
• output: resulting object
• throws: if the first argument is not an array or a object literal; if the second argument is not a string; if the value id undefined

example

const ow = require("objwun");
const o = {
        a: 1, b: 2,
        c: 3, d: 4
    },
    a = [1, 2, 3, 4];

console.log(ow.set(o, 's.t', 1));
// { a: 1, b: 2, c: 3, d: 4, s: { t: 1 } }

console.log(ow.set(o, '0.t.a.d.r', 1));
// {"0": { t: { a: { d: {r: 1}}}}, a: 1, b: 2, c: 3, d: 4}

console.log(ow.set(o, 'a.d.r', 1));
// { a: { d: { r: 1 } }, b: 2, c: 3, d: 4 }

some(array|literalObject, checking function )

• parameters:
  • the source array or literal object
  • a function to check a condition
• output: resulting boolean
• throws: if the first argument is not an array or a object literal; if the second argument is not a function

example

const ow = require("objwun");
const o = {
    a: 1, b: 2,
    c: 3, d: 4
},
a = [{n: 1}, {n: 2}];

console.log(ow.some(a, (e, k) => e.n > 1));
// true

console.log(ow.some(o, (e, k) => k === 'c' && e < 3));
// false

sortBy(array, sort key or function, sort direction )

• parameters:
  • the source array
  • sort key or function
  • sorting versus, default 1 (a negative number goes the other way)
• output: resulting ordered array
• throws: if the first argument is not an array; if the second argument is not a function or a string; if the third is not a number

example

const ow = require("objwun");
const a = [{n: 4.1}, {n: 0.05}, {n: 1.5}, {n: 3.3}];

console.log(ow.sortBy(a, 'n'));
// [ { n: 1.5 }, { n: 1.3 }, { n: 0.1 }, { n: 0.05 } ]

console.log(ow.sortBy(a, 'n', -1),);
// [ { n: 4.1 }, { n: 3.3 }, { n: 1.5 }, { n: 0.05 } ]

console.log(ow.sortBy(a, e => Math.cos(e.n)));
// [ { n: 3.3 }, { n: 4.1 }, { n: 1.5 }, { n: 0.05 } ]

sortBy(array, sort key or function, sort direction )

• parameters:
  • the source array
  • sort key or function
  • sorting versus, default 1 (a negative number goes the other way)
• output: resulting ordered array
• throws: if the first argument is not an array; if the second argument is not a function or a string; if the third is not a number

example

const ow = require("objwun");
const a = [{n: 4.1}, {n: 0.05}, {n: 1.5}, {n: 3.3}];

console.log(ow.sortBy(a, 'n'));
// [ { n: 1.5 }, { n: 1.3 }, { n: 0.1 }, { n: 0.05 } ]

console.log(ow.sortBy(a, 'n', -1),);
// [ { n: 4.1 }, { n: 3.3 }, { n: 1.5 }, { n: 0.05 } ]

console.log(ow.sortBy(a, e => Math.cos(e.n)));
// [ { n: 3.3 }, { n: 4.1 }, { n: 1.5 }, { n: 0.05 } ]

uniq(array)

• parameters:
  • the array with repeated elements
• output: resulting array
• throws: if the first argument is not an array

example

const ow = require("objwun");
const a1 = [2, 1, 1, 2, 3, 1, {a:1}, {a:1}]
const a2 = [function a() {}, function b() {}, function a() {}, ]
console.log(ow.uniq(a1))
// [ 1, 2, 3, { a: 1 } ]
console.log(ow.uniq(a2))
// [ [Function: a], [Function: b] ]

uniqBy(array, key of function)

• parameters:
  • the target array
  • a key string (all elements in the array should be objcet literals); or a function that will receive each element
• output: resulting array
• throws: if the first argument is not an array; if the second is a key (then all array elements must be objects) otherwise it must be a function returning a value

example

const ow = require("objwun");

console.log(ow.uniqBy([
    {a: 1, b: 1},
    {a: 1},
    {b: 3},
    {c: 4},
    {b: 77}
], 'a')); // [ { a: 1, b: 1 }, { b: 3 } ]

console.log(ow.uniqBy([
    2.34,
    3.55,
    2.33
], Math.floor)); // [ 2.34, 3.55 ]

last modified : 19/1/2024

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