mout/src/string/typecast.ts

Modular Utilities

let UNDEF;

/**
 * Parses string and convert it into a native value.
 */
function typecast(val) {
    let r;
    if (val === null || val === 'null') {
        r = null;
    } else if (val === 'true') {
        r = true;
    } else if (val === 'false') {
        r = false;
    } else if (val === UNDEF || val === 'undefined') {
        r = UNDEF;
    } else if (val === '' || isNaN(val)) {
        // isNaN('') returns false
        r = val;
    } else {
        // parseFloat(null || '') returns NaN
        r = parseFloat(val);
    }
    return r;
}

export default typecast;