js & for & for of & for in & forEach, break All In One

js & for & for of & for in & forEach, break All In One

js for break

https://stackoverflow.com/questions/2641347/short-circuit-array-foreach-like-calling-break

    for(let item of str.split(``)) {
        if(!Number.isInteger(item * 1)) {
            isExistUnNumber = true;
            index = str.split(``).indexOf(item);
            break;
        }
    };

for...of break OK ✅

const arr = ['a', 'b', 'c'];

for (const item of arr) {
  if(item !== 'b') {
    console.log('item =', item);
  } else {
    console.log('break');
    break;
  }
}

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...of

// for(let [item, i] of [...str.split(``)].entries()) {

    for(let [i, item] of [...str.split(``)].entries()) {
        if(!Number.isInteger(item * 1)) {
            isExistUnNumber = true;
            index = i;
            break;
        }
    };

for...in break OK ✅

const obj = {a: 1, b: 2, c: 3};

for (const key in obj) {
  console.log('key =', key);
  if (key === 'b') {
    break;
  }
}

// key = a
// key = b

label

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/label

parseInt

demo

https://repl.it/@xgqfrms/js-string-to-number

    for(let item of str.split(``)) {
        if(!Number.isInteger(item * 1)) {
            isExistUnNumber = true;
            index = str.split(``).indexOf(item);
            break;
        }
    };

throw error break

自定义error

forEach

refs

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...of

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/entries

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/break

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/continue

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/switch

https://devdocs.io/

https://flaviocopes.com/how-to-break-for-loop-javascript/

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