72 lines
1.3 KiB
JavaScript
72 lines
1.3 KiB
JavaScript
'use strict'
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const {
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isArray,
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prototype: { filter },
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} = Array
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class InvalidPredicate extends TypeError {
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constructor(value) {
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super('not a valid predicate')
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this.value = value
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}
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}
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function isDefinedPredicate(value) {
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if (value === undefined) {
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return false
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}
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if (typeof value !== 'function') {
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throw new InvalidPredicate(value)
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}
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return true
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}
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function handleArgs() {
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let predicates
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if (!(arguments.length === 1 && isArray((predicates = arguments[0])))) {
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predicates = arguments
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}
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return filter.call(predicates, isDefinedPredicate)
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}
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exports.every = function every() {
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const predicates = handleArgs.apply(this, arguments)
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const n = predicates.length
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if (n === 0) {
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return
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}
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if (n === 1) {
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return predicates[0]
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}
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return function everyPredicate() {
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for (let i = 0; i < n; ++i) {
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if (!predicates[i].apply(this, arguments)) {
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return false
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}
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}
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return true
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}
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}
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exports.some = function some() {
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const predicates = handleArgs.apply(this, arguments)
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const n = predicates.length
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if (n === 0) {
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return
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}
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if (n === 1) {
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return predicates[0]
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}
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return function somePredicate() {
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for (let i = 0; i < n; ++i) {
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if (predicates[i].apply(this, arguments)) {
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return true
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}
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}
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return false
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}
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}
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