/
intval.js
44 lines (41 loc) · 1.3 KB
/
intval.js
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module.exports = function intval(mixedVar, base) {
// discuss at: https://locutus.io/php/intval/
// original by: Kevin van Zonneveld (https://kvz.io)
// improved by: stensi
// bugfixed by: Kevin van Zonneveld (https://kvz.io)
// bugfixed by: Brett Zamir (https://brett-zamir.me)
// bugfixed by: Rafał Kukawski (https://blog.kukawski.pl)
// input by: Matteo
// example 1: intval('Kevin van Zonneveld')
// returns 1: 0
// example 2: intval(4.2)
// returns 2: 4
// example 3: intval(42, 8)
// returns 3: 42
// example 4: intval('09')
// returns 4: 9
// example 5: intval('1e', 16)
// returns 5: 30
// example 6: intval(0x200000001)
// returns 6: 8589934593
// example 7: intval('0xff', 0)
// returns 7: 255
// example 8: intval('010', 0)
// returns 8: 8
let tmp, match
const type = typeof mixedVar
if (type === 'boolean') {
return +mixedVar
} else if (type === 'string') {
if (base === 0) {
match = mixedVar.match(/^\s*0(x?)/i)
base = match ? (match[1] ? 16 : 8) : 10
}
tmp = parseInt(mixedVar, base || 10)
return isNaN(tmp) || !isFinite(tmp) ? 0 : tmp
} else if (type === 'number' && isFinite(mixedVar)) {
return mixedVar < 0 ? Math.ceil(mixedVar) : Math.floor(mixedVar)
} else {
return 0
}
}