70 lines
2.3 KiB
JavaScript
70 lines
2.3 KiB
JavaScript
'use strict';
|
|
|
|
var isCallable = require('is-callable');
|
|
|
|
var toStr = Object.prototype.toString;
|
|
var hasOwnProperty = Object.prototype.hasOwnProperty;
|
|
|
|
/** @type {<This, A extends readonly unknown[]>(arr: A, iterator: (this: This | void, value: A[number], index: number, arr: A) => void, receiver: This | undefined) => void} */
|
|
var forEachArray = function forEachArray(array, iterator, receiver) {
|
|
for (var i = 0, len = array.length; i < len; i++) {
|
|
if (hasOwnProperty.call(array, i)) {
|
|
if (receiver == null) {
|
|
iterator(array[i], i, array);
|
|
} else {
|
|
iterator.call(receiver, array[i], i, array);
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
/** @type {<This, S extends string>(string: S, iterator: (this: This | void, value: S[number], index: number, string: S) => void, receiver: This | undefined) => void} */
|
|
var forEachString = function forEachString(string, iterator, receiver) {
|
|
for (var i = 0, len = string.length; i < len; i++) {
|
|
// no such thing as a sparse string.
|
|
if (receiver == null) {
|
|
iterator(string.charAt(i), i, string);
|
|
} else {
|
|
iterator.call(receiver, string.charAt(i), i, string);
|
|
}
|
|
}
|
|
};
|
|
|
|
/** @type {<This, O>(obj: O, iterator: (this: This | void, value: O[keyof O], index: keyof O, obj: O) => void, receiver: This | undefined) => void} */
|
|
var forEachObject = function forEachObject(object, iterator, receiver) {
|
|
for (var k in object) {
|
|
if (hasOwnProperty.call(object, k)) {
|
|
if (receiver == null) {
|
|
iterator(object[k], k, object);
|
|
} else {
|
|
iterator.call(receiver, object[k], k, object);
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
/** @type {(x: unknown) => x is readonly unknown[]} */
|
|
function isArray(x) {
|
|
return toStr.call(x) === '[object Array]';
|
|
}
|
|
|
|
/** @type {import('.')._internal} */
|
|
module.exports = function forEach(list, iterator, thisArg) {
|
|
if (!isCallable(iterator)) {
|
|
throw new TypeError('iterator must be a function');
|
|
}
|
|
|
|
var receiver;
|
|
if (arguments.length >= 3) {
|
|
receiver = thisArg;
|
|
}
|
|
|
|
if (isArray(list)) {
|
|
forEachArray(list, iterator, receiver);
|
|
} else if (typeof list === 'string') {
|
|
forEachString(list, iterator, receiver);
|
|
} else {
|
|
forEachObject(list, iterator, receiver);
|
|
}
|
|
};
|