es-toolkit/dist/compat/array/includes.mjs

A state-of-the-art, high-performance JavaScript utility library with a small bundle size and strong type annotations.

import { isString } from '../predicate/isString.mjs';
import { isEqualsSameValueZero } from '../../_internal/isEqualsSameValueZero.mjs';
import { toInteger } from '../util/toInteger.mjs';

function includes(source, target, fromIndex, guard) {
    if (source == null) {
        return false;
    }
    if (guard || !fromIndex) {
        fromIndex = 0;
    }
    else {
        fromIndex = toInteger(fromIndex);
    }
    if (isString(source)) {
        if (fromIndex > source.length || target instanceof RegExp) {
            return false;
        }
        if (fromIndex < 0) {
            fromIndex = Math.max(0, source.length + fromIndex);
        }
        return source.includes(target, fromIndex);
    }
    if (Array.isArray(source)) {
        return source.includes(target, fromIndex);
    }
    const keys = Object.keys(source);
    if (fromIndex < 0) {
        fromIndex = Math.max(0, keys.length + fromIndex);
    }
    for (let i = fromIndex; i < keys.length; i++) {
        const value = Reflect.get(source, keys[i]);
        if (isEqualsSameValueZero(value, target)) {
            return true;
        }
    }
    return false;
}

export { includes };