Javascript String padStart()

Introduction

The padStart() method appends string to the start to make it certain length.

The first argument is the desired length, and the second is the optional string to add as a pad.

If not provided, the U+0020 'space' character will be used. 

str.padStart(targetLength [, padString])
  • targetLength - the length of the resulting string
  • padString - Optional, the string to pad
console.log('abc'.padStart(10));         // " ? ? ? ? ? ? abc"
console.log('abc'.padStart(10, "foo"));  // "foofoofabc"
console.log('abc'.padStart(6,"123465")); // "123abc"
console.log('abc'.padStart(8, "0"));     // "00000abc"
console.log('abc'.padStart(1));          // "abc"

let stringValue = "foo"; 

console.log(stringValue.padStart(6));       // "   foo" 
console.log(stringValue.padStart(9, "."));  // "......foo"

The optional argument is not limited to a single character. 

let stringValue = "foo"; 

console.log(stringValue.padStart(8, "bar"));  // "barbafoo"  
console.log(stringValue.padStart(2));         // "foo"



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