jsmodern/dist/string/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 stringRetain(callback) {
        const ctx = this;
        if (!ctx.length)
            return '';
        return ctx.split('').filter(callback).join('');
    },
};
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