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zhangchiqing/leftPad.js

Created March 30, 2016 01:16
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leftPad.js
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leftPad.js
'use strict';
var R = require('ramda');
// leftPad :: Number -> String -> String
// > leftPad(3, '0', '7')
// '007'
// > leftPad(3, '0', '2016')
// '2016'
var leftPad = R.curry(function(num, fill, str) {
var repeat = R.max(0, num - str.length);
return R.join('', R.repeat(fill, repeat)) + str;
});
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