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