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ES6 Exploration: leftPad for natural numbers
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| const leftPad = ( | |
| ( input=0, minOutputLength=0 ) => | |
| String( input ).replace( /^(\d+)$/, ( match, $1='' ) => | |
| '0'.repeat( Math.max( minOutputLength - $1.length, 0 ) ) + $1 | |
| ) | |
| ) | |
| console.log(leftPad(10000, 10)) |
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