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_.js
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_.js
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const _ = {
clamp(val, min, max) {
if (val > max) {
return max;
} else if (val < min) {
return min;
} else {
return val;
}
},
inRange(v, a, b) {
if (!b) {
b = a;
a = 0;
}
if (a > b) {
let temp = b;
b = a;
a = temp;
}
if (a <= v && v < b) {
return true;
} else {
return false;
}
},
words(str) {
return str.split(' ');
},
pad(str, len) {
if (str.length > len) {
return str;
}
let string = str;
for (let i = 1; i <= (len - str.length) / 2; i++) {
string = ' ' + string + ' ';
}
if (len % 2) {
string = string + ' ';
}
return string;
},
has(obj, key) {
return obj[key] !== undefined;
},
invert(obj) {
let newObj = {};
for (let key in obj) {
newObj[obj[key]] = key;
}
return newObj;
},
findKey(obj, predicate) {
for (let key in obj) {
if (predicate(obj[key])) {
return key;
}
}
},
drop(arr, n = 1) {
arr.splice(0, n);
return arr;
},
dropWhile(arr, predicate) {
return this.drop(
arr,
arr.findIndex((e, i) => !predicate(e, i, arr))
);
},
chunk(arr, size = 1) {
let newArr = [];
let oldArr = arr;
for (let i = 0; i <= arr.length + 1; i++) {
if (oldArr && !oldArr[size]) {
newArr[i] = oldArr;
}
newArr[i] = oldArr.splice(0, size);
if (!newArr[i]) {
newArr.splice(i, 1);
}
}
return newArr;
},
};
// Do not write or modify code below this line.
module.exports = _;