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- 'use strict';
- var $TypeError = require('es-errors/type');
- var isInteger = require('math-intrinsics/isInteger');
- var Call = require('./Call');
- var Get = require('./Get');
- var ToBoolean = require('./ToBoolean');
- var IsCallable = require('./IsCallable');
- var ToString = require('./ToString');
- var isObject = require('../helpers/isObject');
- // https://262.ecma-international.org/15.0/#sec-findviapredicate
- module.exports = function FindViaPredicate(O, len, direction, predicate, thisArg) {
- if (!isObject(O)) {
- throw new $TypeError('Assertion failed: Type(O) is not Object');
- }
- if (!isInteger(len) || len < 0) {
- throw new $TypeError('Assertion failed: len must be a non-negative integer');
- }
- if (direction !== 'ascending' && direction !== 'descending' && direction !== 'DESCENDING' && direction !== 'ASCENDING') {
- throw new $TypeError('Assertion failed: direction must be ~ASCENDING~ or ~DESCENDING~');
- }
- if (!IsCallable(predicate)) {
- throw new $TypeError('predicate must be callable'); // step 1
- }
- for ( // steps 2-4
- var k = direction === 'ascending' || direction === 'ASCENDING' ? 0 : len - 1;
- direction === 'ascending' || direction === 'ASCENDING' ? k < len : k >= 0;
- k += 1
- ) {
- var Pk = ToString(k); // step 4.a
- var kValue = Get(O, Pk); // step 4.c
- var testResult = Call(predicate, thisArg, [kValue, k, O]); // step 4.d
- if (ToBoolean(testResult)) {
- return { '[[Index]]': k, '[[Value]]': kValue }; // step 4.e
- }
- }
- return { '[[Index]]': -1, '[[Value]]': void undefined }; // step 5
- };
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