分類：JavaScript

Javascript 幾種 Array 填充 0 的方式

Posted on | by Ran
  1. Array push 
    for (var i = 0, a = []; i < 100; i++) a.push(0);
  2. Array assign 
    for (var i = 0, a = new Array(100); i < 100;) a[i++] = 0;
  3. Typed array conversion slowest 
    [].slice.call(new Uint8Array(100));
  4. Binary concatenation 
    for (var i = 100, a = [], add = [0]; i; i >>=1) {
    if (i & 1) a.push.apply(a, add);
    add.push.apply(add, add);
}
  5. Array Apply 
    Array.apply(null, new Array(100)).map(Number.prototype.valueOf,0);
  6. Array.fill() fastest 
    new Array(100).fill(0);