jsmodern/dist/array/retain.js

An extension to existing JavaScript, influenced by other great languages such as Rust, Dart, Java, Golang, etc.

export const retain = {
    label: 'retain',
    fn: function arrayRetain(predicate) {
        const ctx = this;
        if ('function' !== typeof (predicate)) {
            throw new TypeError(`Expect 'predicate' to be a function`);
        }
        const len = ctx.length;
        if (!len)
            return;
        const retained = ctx.filter(predicate);
        ctx.length = 0;
        for (const n of retained)
            ctx.push(n);
    },
};
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